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Background: RanGAP1 is the activator of the Ras-related nuclear GTPase Ran, which is involved in the nucleo-cytoplasmic transport, mitotic spindle assembly, cell cycle control and nuclear envelope (NE) formation (1, 2). Its roles are accomplished by the asymmetric distribution of its GTP- and GDP-bound forms, enabled by the specific localization of Ran accessory proteins, the Ran GTPase-activating protein RanGAP and the nucleotide exchange factor RCC. Mammalian RanGAP1 is targeted to the NE during interphase and to the spindle and kinetochores during mitosis via SUMOylated C-terminal domain and interaction with the nucleoporin Nup358/RanBP2 (2). RanGAP1 is highly expressed in brain, thymus and testis (3).